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I setup a new VPS with ubuntu 18.04.4, including virtualmin/usermin. In
auth.log I see a lot of
su[12936]: Successful su for domain by root
su[12936]: + ??? root:domain
systemd-logind[148]: New session c315 of user domain .
su[12936]: pam_unix(su:session): session opened for user domain by (uid=0)
su[12936]: pam_unix(su:session): session closed for user domain
in syslog, I see a lot of
systemd[1]: Started Session c314 of user domain.
systemd[1]: Started Session c315 of user domain.
domain is the user of my virtual server defined in the VPS. c314/c315
increased by 1 each time, every 5 minutes (see explanation below). When
running `loginctl list-sessions` those sessions number grow as
"active=yes" and "state=closing" and never disappear from the list.
a random session as an example:
loginctl session-status c315
c315 - domain (1000)
Since: Sat 2020-02-08 20:27:08 UTC; 23h ago
Leader: 12936
TTY: ???
Remote: user root
Service: su; type tty; class user
State: closing
Unit: session-c315.scope
I did a simple test: logged in with ssh, logged out (exit) and re-logged
in. I saw 2 sessions in loginctl list-sessions and the previous one,
which I obviously closed, never disappeared from the list.
as a "bonus": Virtualmin apparently open/close a session for the virtual
server user to do its stuff causing the number of ghost sessions to grow
forever...
I posted this question in server fault, askubuntu, ubuntuforums and
virtualmin - no one knew what to tell me. I have no idea what/where to
look for... Please advice :) Thanks in advance.
FWIW: Someone from virtualmin forum told me that he had a similar
problem with debian 9 and it was fixed in debian 10.
After a boot I see this, maybe related?
Feb 13 06:39:48 domain systemd[1]: Starting User Manager for UID 1000...
Feb 13 06:39:48 domain systemd[636]: Failed to create
/user.slice/user-1000.slice/user@1000.service/init.scope control group:
Permission denied
Feb 13 06:39:48 domain systemd[636]: Failed to allocate manager object:
Permission denied
Feb 13 06:39:48 domain systemd[1]: user@1000.service: Failed with result
'protocol'.
Feb 13 06:39:48 domain systemd[1]: Failed to start User Manager for UID 1000
lsb_release -a; uname -a; grep 1000 /etc/passwd
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
Linux domain.com 4.15.0 #1 SMP Mon Dec 9 19:36:21 MSK 2019 x86_64 x86_64 x86_64
GNU/Linux
domain:x:1000:1000::/home/domain:/bin/bash
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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loginctl list-sessions shows ghost sessions that are never completely closed
https://bugs.launchpad.net/bugs/1863228
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